When my kids were younger we read Miss Rumphius by Barbara Cooney, and it became a touchstone for these sorts of concerns. The message of the book (which is lovely for all ages, though intended for an audience of young children) is that each of us can live our lives in many different ways, but in the end we need to make sure we do something to leave the world a better place than it would have been without us. We talked a lot about that message, and explored the multiplicative effect: if everyone does stuff to make the world a better place, the world will be a dramatically better place within a generation, and each generation can build on the progress of the previous one. The world is a big complicated place, but all we can do is all anyone can do: try to live our lives in ways that increase the good.
The story shows how simple actions can be very powerful. In the case of Miss Rumphius, she scatters lupin seeds everywhere she goes. This small act of goodness eventually results in self-sowing, resulting in an increasingly profound change in the landscape, something which will outlive her and become self-perpetuating. And so in our lives we have tried to get in the habit of doing simple things too: picking garbage, doing random acts of kindness, building ephemeral art for people to enjoy and wonder about, making secret gifts to people in need, that sort of thing.
It's important to acknowledge injustice in the world, and to validate kids' feelings about it. But I think it's important to give those feelings an outlet, and I think that most of the time the best outlet is tangible, local, simple actions of charity and goodness.
Miranda
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